This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A050239 #26 Aug 03 2025 03:48:06 %S A050239 5,181,313,3187813 %N A050239 Consecutive square palindromic primes; palindromic primes of the form x^2 + (x+1)^2, where x values are given by A050236. %C A050239 No other terms < 10^20. - _Patrick De Geest_, Aug 15 1999 %H A050239 Patrick De Geest, <a href="http://www.worldofnumbers.com/sumsquare.htm">Palindromic Sums of Squares of Consecutive Integers</a> %H A050239 Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_014.htm">Puzzle 14. Pal-Primes and sum of powers</a>, The Prime Puzzles & Problems Connection. %H A050239 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PalindromicPrime.html">Palindromic Prime</a> %t A050239 Select[Total/@Partition[Range[1300]^2,2,1],PalindromeQ[#]&&PrimeQ[#]&] (* _Harvey P. Dale_, Aug 19 2022 *) %Y A050239 Cf. A050236. %Y A050239 Subsequence of A002385. %K A050239 nonn,nice,hard,base,more %O A050239 1,1 %A A050239 _Eric W. Weisstein_